我晕啦,终于成功了,原来是我的基础不稳固造成的,呵呵今天成功了!!!

来源：互联网发布：大数据应用趋势分析编辑：程序博客网时间：2024/05/16 13:00

import java.util.*;
import java.io.*;
import javax.comm.*;

public class Jcomm
{

static OutputStream out;
static InputStream in;

     public static void main(String args[]) throws IOException
     {
         BufferedReader buf=new BufferedReader(new InputStreamReader(System.in));
         Enumeration ports = CommPortIdentifier.getPortIdentifiers();
         String portName;
         CommPortIdentifier portId;
         SerialPort serialPort;

         if (ports == null)
         {
   System.out.println("No comm ports found!");

         }
         else
            while(ports.hasMoreElements())
            {
    System.out.println(" "+ ((CommPortIdentifier) ports.nextElement()).getName());
                System.out.print("Selet one port from the list up:");
                portName=buf.readLine();
                try
                {
                   portId=CommPortIdentifier.getPortIdentifier(portName);
                   try
                   {
                       serialPort=(SerialPort)portId.open("Jcomm",2000);
                     try
                     {
                        serialPort.setSerialPortParams(9600,SerialPort.DATABITS_8,SerialPort.STOPBITS_1,SerialPort.PARITY_NONE);
                        System.out.println("Port Open Successfully!");
                        serialPort.close();
                     }
                     catch(UnsupportedCommOperationException e)
                     {
                        System.out.println("Port set failed!");
                     }
                   }
                   catch(PortInUseException e){}
                 }
                 catch(NoSuchPortException e){}
             }
     }
}

把上面的try欢欢位置就ok了!